G rinding-mill



N6 Model.) 2" Sheets-Sheet 1.

.S. P. WALLING.

GRINDING MILL. No. 252,158. PatentedJa.n.10,1'882.

N. PLTERS. Plmlwulha m her. Walhingiun. D.C.

' UNITED STATES PATENT OFFICE.

STEPHEN P. WALLING, OF SOUTH EDMESTON, NEW YORIL,

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 252,158, dated January 10, 1882. Application filed Ju1y 26,1881. (No model.)

and State of New York, have invented certain Improvements in Grinding-Mills, of which the following is a specification.

My invention relates to grinding-mills,and more particularly to the step and bearings by which the lower and upper ends of the spindle aresupported.

The invention also consists in other details hereinafter explained. .i

In the accompanyingdra-wings, Figure 1 represents a side elevation of my improved mill 5 Fig 2, a vertical central sect-ion of the same; Fig. 3, a perspective view of the step and its supporting parts separated one from another;

bearing of the spindle, on the line .70 mot Fig. 1; :Fig. 5, a view of the band or cordemployed to close the space between the curb and its 'top or cover. l

The primary object of my invention isto pro: vide means whereby the bearings of the spindle may be accurately adj usted to properly support the spindle, avoid excessive friction or undue play, and compensate fODWBZH'. To this end I provide a stationary-box or chamber at the center of the base or bed of the mill-frame, preferably casting the same in one piece therewith, as hereinafter explained, within which box or chamber are suspended a step and bear in gs, the former from a yoke supported or carried by the bridge-tree, and the latter by a flange at its upper end, resting upon ashoulder or ledge in the box or chamber. The step is furnish ed with a self-ad j ustin g beari ng-plate, and the side bearings of the spindle are formed by blocks passingradiallythrough openings in an encircling cage or cylinder suspended or sus-.

tained by a flange within the box or chamber, as jin entioned. The side bearing-blocks are pressed inwardby set-screws passing through. the walls of the box or chamber within which the step and cage are suspended. An oil-passage is formed in the lower endof thespindle, passji'ngupward through the center and open ingj outward at the side, in order to facilitate the delivery of oil to the end of the spindle and its bearing-plate. The upper end of the spin elastic'cushions, the space between the curb and top being closed by an encircling band or cord. Referring now to the drawings, A represents the frame and easing of the mill, the curb a,

its bottom or floor b, the supporting-columns o, and the bed or based being preferably formed in a single casting. The base or bed d is provided with a fixed central box or chamber, B,

preferably cast therewith, adapted toreceive the step and bearings ofthe spindle O, as shown in Fig. 2. Fig.4,ahorizontal sectionthrough the upper The construction of the step and hearing will be clearlyunderstood.byret'erring to Figs. 2 and 3, in which D represents the step, provided in its upper face with a cavity to receive a bearing-plate, f. The bottom of the cavity or the lower face of the bearing-plate is made convex in order that the plate may rock and adjust itself to the end of the spindle; and the plate is provided with ribs or feathers g, which project into recesses .h to prevent the turning of the plate.

The step D is suspended from a yoke, E,- by rods t, the ends of which are formed with suit able heads and seated in cavities formed in the sides of the central opening of the yoke and in the sides of the .step D. A cage or cylin der, F, is interposed between the steplD and yoke E, its upper end being provided with a flange to rest upon a shoulder within the box or chamber, and its sides being grooved, as shown at j, to receive the suspending-rods t.

The sides of the cage or cylinder are provided with. radial openings orpassage's k to receive the bearing-blocks G, which are urged against the sides of the spindle by set screws H, passing through the walls of the box or'casing'B.

All tendency of the cage F to turn is overcome by a set-screw, K, passing through the wall of the box or case B and; bearingdirectly against the cage, this screw being tightened before the bearing-blocks are adjusted.

The yoke E is formed with "critical arms Z,

the lower ends of which are rounded to rest in slight cavities or depressions in the upper face of the bridge-tree I, said brid ge-tree being supported at one end upon a pivot, arranged to encircle the box or casing B, and sustained at its outer end by a screw rod or stem provided with an adjusting-nut, J. The yoke being thus supported, it will be seen that it, together with the step, will rise and fall in a true vertical direction when the bridge-tree is moved, thus avoiding all tendency to cramp or bind the spindle. The upper end of the spindle is carried by a yoke or frame, L, secured upon the top or cover M of the casing of the mill, and formed with a central openingto receive the spindle and with radial cavities to receive the bearing-blocks N, which are pressed against the sides of the spindle by set-screws 0.

Vertical play of the spindle is prevented by means of a central screw, P. passing through the top of the yoke or frame L and bearing upon the upper end of the spindle.

The 'top or cover M is held in position by vertical bolts or rods Q, which are seated at their lower ends in, the upper portions of columns c at the sides of the curb or casing, and preferably secured by transverse pins, though it is apparent that they may be secured or held in place by casting the metal around them.

The top or cover is formed with ears a, through which the rods pass, the ears resting upon the upper one of a series of washers, 0, which in turn rest upon a bed or cushion, p, of rubber or like elastic material, seated in the upper ends of the columns. Nuts q, applied to the rods Q, bear upon the ears to force them down upon the cushions with any desired degree of pressure.

The removal of one or more washers permits the top or cover, to the lower face of which one of the grinding-disks is rigidly secured, to be raised or lowered to compensate for wear of the disks, while by the application or. removal of washers at the different sides of the curb the adjustment of the top or cover may also be readily effected. A series of grooves or recesses, r, are formed in the edge of that portion of the top or cover which fits within the curb or casing, to fit over ribs or projections 8 formed thereon and prevent the turning or shiftingof the cover.

The narrow space between the curb and top or cover is closed by a band or cord, R, which is provided with suitable fastenings at its ends, and is passed around the cover or top and united at its ends, as shown. The cord or band prevents'the escape of dust, and in a measure relieves the mill of heat and dampness.

As shown in Figs. 1 and 2, the curb or casin g is formed with openings S at several points in its sides or walls, closed by wickets or covers T. These openings permit inspection of the interior and greatly facilitate the setting and adjustment of the stones. Any form of cover may .be employed, though a simple cap or plate secured to a spring-arm, t, pivoted to the side of the curb or casing, is preferred.

In order to relieve the mill of alljar or shock, I employ, in addition to the elastic cushions beneath the ears of the top or cover, similar cushions beneath the adjusting-nut J and checkplateU,throngh whichlatterthescrewPpasses. For the purpose of oiling the upper bearing of the spindle, the nut P may be provided with a central oil-passage extending through itfrom end to end, while, in order the better to insure the delivery of oil between the end of the spindle and its bearing-plate, an oil-passage extends from its lower end upward and opens at the side of the spindle into the oil chamber, as shown in Fig. 2.

The runner-stone is supported upon a horizontal bed or plate secured upon the spindle, and is secured by bushing in the ordinary manner. .Snfficient space is left between the step and the lowerend of the cage to permit all necessary rise and fall of the former, as indicated in the drawings.

I am aware that a continuous ring orpackingof elastic hose has been interposed between a millstone and its curb, thatwedges and elastic washers have been placed under the ears or lugs of the top or cover of a mill, and that a yoke has been cast with radial cavities open at their upper side. These I do not claim. I am not, however, aware that any one has hitherto provided a band'or cord having connectingdevices at its ends, whereby it might be applied to and removed from a mill such as described without removing the top of the mill; noram I aware that washers have been placed below the lugs or ears of a mill-top, as herein explained, so that by increasing or diminishing their numbers the adjustment and elevation of the upper stone might be effected; nor that a yoke has been formed complete in one piece,

with radial 'eavitiesopen only on the inner side, whereby the displacement'of the bearingblocks is prevented so long as the spindle is in place.

Having thus described myinvention, what I claim is- 1. In combination with a mill-spindle, a bridge-tree, a yoke supported thereon, a step suspended. from said yoke, and a cage supported above the step, encircling the spindle, and provided with adjustable bearing-blocks, substantially as shown and described.

2. In combination with a mill-spindle, a stationary box or chamber provided with radial set-screws, a bridge-tree extending'o'n opposite sides of the same, a yoke supported upon the bridge-tree, a step suspended from the yoke, anda cage encircling the spindle and supported above the step, and provided with radiallym'oving bearing-blocks adapted to be adj ust-ed by the set-screws, as set forth.

3. The herein-described support for millspin'dles, consisting of a yoke, a step-plate suspended therefrom by headed rods seated in sockets in the yoke and plate, and a rocking bearing-plate seated in the step-plate, substantially as shown.

4. In combination with the step having a cavity provided with recessed sides, the rockthe top or cover M, provided with ears wrest-- ing bearing-plate provided with ribs or feathing upon the Washers, and nuts q, applied to ers to enter said recesses, and thereby prevent the rods above said ears, substantially as shown. 10

the plate from turning. STEPHEN P. WALLING. 5 5. In combination with the curb a, the rods Witnesses:

Q, seated in the columns 0, the elastic cushions HIRAM O. HOOKER,

p, the washers 0, resting upon said cushions, NELSON W. MATTERSON. 

